<template>
  <div class="row">
    <div v-for="column in columnList"
         :key="column._id"
         class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
          <img :src="column.avatar && column.avatar.url"
               :alt="column.title"
               class="rounded-circle border border-light my-3">
          <h5 class="card-title">{{ column.title }}</h5>
          <p class="card-text text-start">{{ column.description }}</p>
          <router-link :to="`/column/${column._id}`"
                       class="btn btn-outline-primary">点击进入专栏</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { defineComponent, PropType, computed } from 'vue'
import { ColumnProps } from '@/store'
import { addColumnAvatar } from '@/hook/helper'


export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true
    }
  },
  setup(props) {
    const columnList = computed(() => {
      return props.list.map(column => {
        addColumnAvatar(column, 50, 50)
        return column
      })
    })
    return { columnList }

  }
})
</script>
<style scoped>
.card-body img {
  width: 50px;
  height: 50px;

}

.card-text {
  line-height: 20px;
  height: 60px;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  word-break: break-all;
  display: -webkit-box;
  text-overflow: ellipsis;
  overflow: hidden;
}
</style>
